Questions from Essentials of Statistics

Q: Describe what is measured by the estimated standard error in the bottom

Describe what is measured by the estimated standard error in the bottom of the independent-measures t statistic.

Q: As noted on page 332, when the two population means are

As noted on page 332, when the two population means are equal, the estimated standard error for the independent- measures t test provides a measure of how much difference to expect between two sample...

Q: Two samples are selected from the same population. For each of

Two samples are selected from the same population. For each of the following, calculate how much difference is expected, on average, between the two sample means. a. One sample has n = 6, the second h...

Q: For each of the following, assume that the two samples are

For each of the following, assume that the two samples are obtained from populations with the same mean, and calculate how much difference should be expected, on average, between the two sample means....

Q: One sample has SS = 72 and a second sample has SS

One sample has SS = 72 and a second sample has SS = 24. a. If n = 7 for both samples, find each of the sample variances and compute the pooled variance. Because the samples are the same size, you shou...

Q: Two separate samples, each with n = 9 individuals, receive

Two separate samples, each with n = 9 individuals, receive different treatments. After treatment, the first sample has SS = 546 and the second has SS = 606. a. Find the pooled variance for the two sam...

Q: For the each of the following studies determine whether a repeated-

For the each of the following studies determine whether a repeated-measures t test is the appropriate analysis. Explain your answers. a. A researcher is examining the effect of violent video games on...

Q: What is the defining characteristic of a repeated-measures or within

What is the defining characteristic of a repeated-measures or within-subjects research design?

Q: A researcher conducts an experiment comparing two treatment conditions with 22 scores

A researcher conducts an experiment comparing two treatment conditions with 22 scores in each treatment condition. a. If an independent-measures design is used, how many subjects are needed for the ex...

Q: A sample of n = 12 individuals participates in a repeated-

A sample of n = 12 individuals participates in a repeated-measures study that produces a sample mean difference of MD = 7.25 with SS = 396 for the difference scores. a. Calculate the standard deviatio...